status of hybrid target rd at kek-linac t.takahashi hiroshima university april 25 2012 kilc12...
DESCRIPTION
experimental site KEKB LINAC Switch yard 8 GeV e- ~ nc/bunch upto 25Hz single bunch After the earthquake: beam recovered to 3GeV 8 GeV operation expected later half of 2012TRANSCRIPT
Status of Hybrid target R&D at KEK-LINAC
T.TakahashiHiroshima University
April 25 2012KILC12 大邱廣域市
Collaborators:V. Strakhovenko O. Dadoun, R. Chehab, A.Variola, L. Rinolfi, O. Dadoun,T.Kamitani, T.Suwada, T.Omori, J.Urakawa,K.Furukawa, K.Umemori,M.Satoh,T.Sugimura,S.Kawada, T.Akagi, Y. Uesugi
Contents
• Status of previous experiments–~ same as LCWS2011
• Temperature measurement 2012 January• Prospects
experimental site KEKB LINAC
Switch yard
8 GeV e-~ nc/bunchupto 25Hz single bunch
After the earthquake:beam recovered to 3GeV8 GeV operation expected later half of 2012
Setup
8GeV e- 1mm W crystal
Sweeping Magnet0.96T 0.75m
amorphous W8 mm18 mm
Analyzing magnet5 ~ 30MeV
pictures
e- 8GeV
W Crystal on the goniometer
Sweeping magnet
pictures
movable stage
amorphoustargets
thermocoupolesattached back end
posit
ron
yiel
d (a
rb. u
nit)
angle of crystal axis<111> w.r.t. beam (mr)
rot. in vertical plain
esweep mag
8 mm
Rocking curve
1
2
3.4 0.117.7 0.4
1 2
2 22 21 2
( )f A B Const
same for horizontal rotationPreliminary
factor 3 enhancement
e+ yield
amorphous thickness [mm]
e+ d
etec
ted
[a.u
]P=20MeV
Need simulation for analyzing the magnet collimator , detector to evaluate e+ yeilds
0 2 4 6 8 10 12 14 16 180
5
10
15
Conventional
Hybrid ON axis
Hybrid OFF axis
Detector acceptance• Simulation of the is in progress by Y.Uesugi
Detector acceptance• Simulation of the is in progress by Y.Uesugi
simulation in progress
Preliminary4 6 8 10 12 14 16 18 20 22
0
200
400
600
800datasimulation
P(MeV)
e+ y
ield
(a.u
.)
18 mm conventional
agreement of data and simulation look finelow acceptance 0.0005e+/e- takes time for simulation
Temperature measurement w/ thermocouples
back plane of amorphous target thermocouple
approximately 1mm x 1mm
to fast data loggerread temperature each 10ms
bunch by bunch temperature variationPEDD information by thermocouple
temperature at equilibriumtotal energy deposit
bunch by bunch temp.• dT provides a measure of PEDD
hybrid on axis
conventional
hybrid off axis
Simulation
Measured
Making thermo couple array
thermocouples
temperature distribution of amorphous targetbunch by bunch bases
design in progress at Hiroshima
temperature measurementJanuary 2012
temperature measurement
summary• Systematic data for hybrid target R&D
– yield from various target thickness– momentum 5, 10, 20 MeV– G4 Simulation in progress
• energy deposit/temperature– Thermocouple array works– in progress. G4 simulation is ready.– Systematic data in next experiments
–( but we need to wait for full recovery of KEKB LINAC)